A 20-year-old man is in a critical condition after falling 10 metres from a tree he was in and rolling down a bank.
The man landed on his head at Orere Point, at the top of the Firth of Thames, at about 2am on Saturday morning.
Auckland Rescue Helicopter Trust communications manager Lincoln Davies said the man was unconscious when the Mechanics Bay Westpac 2 Red Chopper crew met the St John Ambulance at a nearby field to transport him to Auckland City Hospital.
The ambulance was en route to hospital when the man's condition deteriorated and it called for helicopter assistance, a St John spokesman confirmed.
The paramedics carried out a rapid sequence intubation to assist the patient's breathing.